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    The Biggest power gains for your 400-430-455 engine are with TA’s aluminum cylinder heads, without question! We offer multiple cylinder heads to fit every performance combination. TA heads are cast from 356 aluminum and heat treated to T-6 specification. TA then machines the castings in house, on state of the art CNC milling machines, resulting in the highest degree of quality. TA Performance has been manufacturing cylinder heads for nearly 20 years and have gained an excellent reputation not only within the Buick community, but within the entire automotive aftermarket, for quality of craftsmanship as well as performance. Over the years, through our own testing as well as feedback from our dealers and customers, we have and will continue to update and expand our cylinder head offering. By doing so, Buick Big Block powered cars utilizing TA’s aluminum cylinder heads will continue to out perform more popular engine makes. TA Performance operates one of the few full service head manufacturing facilities in the automotive aftermarket and the only one within the Buick community

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    On TA’s Stage 4 Tall Port series heads, we moved the intake pushrod in order to widen the intake runner. Though the CFM is similar to our Stage 3 heads, the wider runner does a better job at complimenting increased intake volumes as found with Nitrous, Alcohol or Forced Induction  combinations. Because we moved the intake pushrod, the Stage 4 heads do require the use of a roller camshaft with offset (TA1414) roller lifters. A closed combustion chamber design which measures 58 cc’s increases the compression ratio without having to use a domed piston, which reduces rotating weight. Ported Stage 4 Heads flow almost 395 CFM at high lift and an amazing 345 CFM at .500”! Stage 4 exhaust ports can be ported to 270+ CFM.

    Stage 4 heads require a raised runner intake manifold from our SP-2 series with additional port matching or a custom made sheet metal manifold. Use of these heads does require Stage 2 style headers. Headers or manifolds used on Standard, Stage 1 or TA’s Stage 1 aluminum heads will not work. Stage 4 heads also require a unique roller rocker set due to the re-located valve centers and repositioned intake pushrods.

    On 11:1 Compression engines out of the box performance is usually 80+ HP. These heads can support pump gas combinations up to 700+ HP and race combinations up to 900+ HP.

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Stage 4 Primary Use: 

• When the highest performance full race head is required for the most extreme combinations
• When hood clearance is not an issue
• When the purchase of headers, rockers, intake, etc are not an issue
• When 11:1 or more compression is desired

Intake Manifold: SP2, Custom
Exhaust Manifold/Headers: Oval Port Headers
Rocker Assembly: Stage 4 Roller, TA Shaft Mount
Head Bolt/Stud Kit: Stage 2
Camshaft: Roller
Power Potential: 700-900+
Valves Int./Exh: 2.250 / 1.800*
CFM (base) Int./Exh: 325 / 230 @ .550” Lift
CFM (max) Int./Exh: 395 / 270 (Fully ported, 2.300" Int Valve)
Chamber CC’s: 58

*On 400 cid engines, 2.000” Int. and 1.650” Exh. are used due to bore size, 2.250” Intake valve available as an option, 3/8” or 11/32” valve stem diameters available

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